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the claim
Smog clears up on certain days due to changes in wind speed and atmospheric mixing height
the verdict
SUPPORTED
the evidence backs this
refutedsupported
the weight of evidence
4 sources for · 0 against

Multiple studies demonstrate that meteorological factors such as wind speed and atmospheric mixing height (boundary layer height) play a critical role in the dispersion and removal of air pollutants, causing smog episodes to clear up when these factors increase.

Evidence for · 4
Effect of wind speed on the level of particulate matter PM10 concentration in atmospheric air during winter season in vicinity of large combustion plant
2020 · cited by 75
Confirmed that low wind speeds lead to higher particulate matter concentrations (smog episodes), while wind helps disperse them.
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The analysis

The retrieved literature consistently confirms that wind speed and atmospheric mixing height/boundary layer height are primary meteorological drivers responsible for the dispersion, dilution, and clearing of air pollutants and particulate matter (smog).

More for · 3
Impact of synoptic meteorological conditions on air quality in three different case studies in Rome, Italy
2021 · cited by 32
Demonstrates that natural removal of particulate matter is favored by intense winds and affected by the height of the mixing layer.
Importance of Urban Green at Reduction of Particulate Matters in Sihwa Industrial Complex, Korea
2020 · cited by 24
Shows that particulate matter reduction rates are related to increased atmospheric mixing height and active wind blowing.
Impact analysis of meteorological variables on PM2.5 pollution in the most polluted cities in China
2023 · cited by 21
Identifies planetary boundary layer height and wind speed as key meteorological variables whose reduction leads to increased pollutant concentrations.
Everything we examined (12)
  1. Effect of wind speed on the level of particulate matter PM10 concentration in atmospheric air during winter season in vicinity of large combustion plantpeer-reviewedsupports
  2. Interactions of particulate matter and pulmonary surfactant: Implications for human health.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  3. Invited review: Recommendations for reporting intervention studies on reproductive performance in dairy cattle: Improving design, analysis, and interpretation of research on reproduction.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  4. Impact of synoptic meteorological conditions on air quality in three different case studies in Rome, Italypeer-reviewedsupports
  5. Influence of Climate Change and Meteorological Factors on Houston’s Air Pollution: Ozone a Case Studypeer-reviewedno side takennot shown: read and judged not to bear on this claim
  6. Importance of Urban Green at Reduction of Particulate Matters in Sihwa Industrial Complex, Koreapeer-reviewedsupports
  7. Insights into ozone pollution control in urban areas by decoupling meteorological factors based on machine learningpeer-reviewedno side takennot shown: read and judged not to bear on this claim
  8. Modelling the impacts of emission changes on O3 sensitivity, atmospheric oxidation capacity, and pollution transport over the Catalonia regionpeer-reviewedno side takennot shown: read and judged not to bear on this claim
  9. Impact analysis of meteorological variables on PM2.5 pollution in the most polluted cities in Chinapeer-reviewedsupports
  10. Investigating the response of China's surface ozone concentration to the future changes of multiple factorspeer-reviewedno side takennot shown: read and judged not to bear on this claim
  11. Assessment of Air Pollution and Lagged Meteorological Effects in an Urban Residential Area of Kenitra City, Moroccopeer-reviewedno side takennot shown: read and judged not to bear on this claim
  12. A review on factors influencing fog formation, classification, forecasting, detection and impacts.peer-reviewedno side takennot shown: read and judged not to bear on this claim
The paper trail · every fact has a biography
first checked05 Aug 2026
judged → SUPPORTED · 8705 Aug 2026
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